Orofacial Development Flashcards
When does the development of orofacial structures occur during prenatal development?
The development of orofacial structures occurs from the fourth week to the twelfth week of prenatal development, spanning the later part of the embryonic period and the early part of the fetal period.
Which structures are involved in the development of the orofacial region?
The orofacial structures that develop during this time include the palate, nasal septum, nasal cavity, and tongue.
When does the formation of the palate occur during prenatal development?
The formation of the palate begins in the embryo and continues into the fetus, taking place over several weeks of prenatal development.
When does the formation of the palate begin during prenatal development?
The formation of the palate begins during the fifth week of prenatal development within the embryonic period.
What are the two embryonic structures involved in the formation of the palate?
The two embryonic structures involved in the formation of the palate are the primary palate and the secondary palate.
When is the palate completed during prenatal development?
The palate is completed during the twelfth week within the fetal period.
How is the final palate developed during prenatal development?
The final palate is developed in three consecutive stages: 1. Formation of the primary palate 2. Formation of the secondary palate 3. Completion of the final palate
How is the final palate completed during prenatal development?
The completion of the final palate involves the fusion of swellings or tissue from different surfaces of the embryo to meet and join.
When does the intermaxillary segment form during prenatal development?
The intermaxillary segment forms during the fifth week of prenatal development.
How does the intermaxillary segment form?
The intermaxillary segment forms as a result of the fusion of the two medial nasal processes internally within the embryo.
What does the intermaxillary segment give rise to during prenatal development?
The intermaxillary segment gives rise to the primary palate (or primitive palate).
What role does the primary palate serve during its formation?
At the time of its formation, the primary palate serves as a partial separation between the developing oral cavity proper and the nasal cavity.
What will the primary palate form in future development?
In future development, the primary palate will form the premaxillary part of the maxilla, which is the anterior one-third of the hard palate.
Where is the premaxillary part of the hard palate located, and what does it contain?
The premaxillary part of the hard palate is located anterior to the incisive foramen and contains the maxillary incisors.
During the sixth week of prenatal development, the bilateral maxillary processes will give rise to two ___?
During the sixth week of prenatal development, the bilateral maxillary processes give rise to two palatal shelves (or lateral palatine processes).
When and where is the tongue forming during prenatal development?
The tongue is forming on the floor of the primitive pharynx during the sixth week of development, at the same time the bilateral maxillary processes give rise to two palatal shelves.
What happens intially as the tongue grows during prenatal development?
As the tongue grows, it initially fills the common nasal and oral cavity.
How does the developing tongue assist in the fusion of the palatal shelves?
As the developing tongue muscles begin to function, the tongue contracts and moves out of the way of the developing lateral palatal shelves, helping avoid any obstacle to their future fusion by moving both anteriorly and inferiorly.
What does the secondary palate give rise to during prenatal development?
The secondary palate gives rise to the posterior two-thirds of the hard palate, which contains certain maxillary anterior teeth (canines) and posterior teeth, all located posterior to the incisive foramen.
What else does the secondary palate give rise to during prenatal development?
The secondary palate also gives rise to the soft palate and its uvula.
What do the median palatine raphe and median palatine suture indicate?
The median palatine raphe within the mucosa lining and the associated deeper median palatine suture on the adult maxillary bone indicate the line of fusion of the palatal shelves.
How is the palate completed during prenatal development?
The palate is completed when the posterior part of the primary palate meets the secondary palate due to increased growth, and they gradually fuse in an anterior to posterior direction.
What happens when all three palatal processes completely fuse?
When all three palatal processes completely fuse, they form the final palate.
What does the final palate include?
The final palate includes both the hard and soft palate.
When does the fusion of the palatal processes into the final palate occur?
The fusion of the palatal processes into the final palate occurs during the twelfth week of prenatal development.
What happens when the palatal processes fuse during the twelfth week of prenatal development?
When the palatal processes fuse, the mature oral cavity becomes completely separated from the nasal cavity, which has begun developing its nasal septum.
What causes a cleft palate?
A cleft palate is caused by the failure of fusion of the palatal shelves with the primary palate and/or with each other.
What are the potential outcomes of a cleft palate?
A cleft palate can result in varying degrees of disability.
What factors may contribute to the development of a cleft palate?
A cleft palate may be hereditary or associated with environmental factors.
How common is cleft palate?
Cleft palate occurs in 1 or 2 in 1000 cases, which is about 1%.
Can cleft palate occur with other abnormalities?
Yes, cleft palate may be isolated or associated with other abnormalities, such as cleft lip. It may involve only the soft palate or extend through to the hard palate.
How do isolated forms of cleft palate compare to cleft lip in terms of frequency?
Isolated forms of cleft palate are less common than cleft lip but are more common in women.
What complications can arise from a cleft palate?
Complications from a cleft palate can include difficulty with nursing or feeding, increased oronasal infections, and challenges with speech development and appearance.
